[CRASH] Fix scan_op.connection_pattern and add test

Fix typos in new cudnn v2 blurb

[CRASH ] Fix crash in scan.grad when same variable used for multiple outputs

Raise an error if cudnn v2 rc* are used.

fix code samples in debug_faq docs

- fixed the order of arguments in an isinstance() function call
- changes the expected output of a command to match the actual output

cudnn doc update.

Add connection_pattern

Apply decorator for stochastic tests on test_run_nnet

Add (zero) gradient for any() and all().

Python3 compatibility.

Minor fixes

[CRASH] Fix crash with scan grad and add unit test

Fix alpha_merge and cudnn conv gradient

Traceback